package com.hx.haowumall.haowumallware.service.impl;

import com.alibaba.fastjson.TypeReference;
import com.hx.common.exception.NoStockException;
import com.hx.common.to.mq.OrderTo;
import com.hx.common.to.mq.StockDetailTo;
import com.hx.common.to.mq.StockLockedTo;
import com.hx.common.utils.R;
import com.hx.haowumall.haowumallware.entity.WareOrderTaskDetailEntity;
import com.hx.haowumall.haowumallware.entity.WareOrderTaskEntity;
import com.hx.haowumall.haowumallware.feign.OrderFeignService;
import com.hx.haowumall.haowumallware.feign.ProductFeignService;
import com.hx.haowumall.haowumallware.service.WareOrderTaskDetailService;
import com.hx.haowumall.haowumallware.service.WareOrderTaskService;
import com.hx.haowumall.haowumallware.vo.OrderItemVo;
import com.hx.haowumall.haowumallware.vo.OrderVo;
import com.hx.haowumall.haowumallware.vo.SkuHasStockVo;
import com.hx.haowumall.haowumallware.vo.WareSkuLockVo;
import com.rabbitmq.client.Channel;
import lombok.Data;
import org.springframework.amqp.core.Message;
import org.springframework.amqp.rabbit.annotation.RabbitHandler;
import org.springframework.amqp.rabbit.annotation.RabbitListener;
import org.springframework.amqp.rabbit.core.RabbitTemplate;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hx.common.utils.PageUtils;
import com.hx.common.utils.Query;

import com.hx.haowumall.haowumallware.dao.WareSkuDao;
import com.hx.haowumall.haowumallware.entity.WareSkuEntity;
import com.hx.haowumall.haowumallware.service.WareSkuService;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.StringUtils;


@Service("wareSkuService")
public class WareSkuServiceImpl extends ServiceImpl<WareSkuDao, WareSkuEntity> implements WareSkuService {

    @Autowired
    WareSkuDao wareSkuDao;

    @Autowired
    ProductFeignService productFeignService;

    @Autowired
    RabbitTemplate rabbitTemplate;

    @Autowired
    WareOrderTaskDetailService orderTaskDetailService;

    @Autowired
    WareOrderTaskService orderTaskService;

    @Autowired
    OrderFeignService orderFeignService;


    /**
     * wareId: 123,//仓库id
     * skuId: 123//商品id
     * */
    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        QueryWrapper<WareSkuEntity> wareSkuQueryWrapper = new QueryWrapper<>();
        String skuId = (String) params.get("skuId");
        if (!StringUtils.isEmpty(skuId)){
            wareSkuQueryWrapper.eq("sku_id",skuId);
        }

        String wareId = (String) params.get("wareId");
        if (!StringUtils.isEmpty(wareId)){
            wareSkuQueryWrapper.eq("ware_id",wareId);
        }

        IPage<WareSkuEntity> page = this.page(
                new Query<WareSkuEntity>().getPage(params),wareSkuQueryWrapper
        );

        return new PageUtils(page);
    }

    @Override
    public void addStock(Long skuId, Long wareId, Integer skuNum) {
        //1、判断如果没有这个库存记录，为新增操作
        List<WareSkuEntity> entities =
                wareSkuDao.selectList(new QueryWrapper<WareSkuEntity>().eq("sku_id", skuId).eq("ware_id", wareId));
        if (entities == null || entities.size() == 0){
            WareSkuEntity skuEntity = new WareSkuEntity();
            skuEntity.setSkuId(skuId);
            skuEntity.setStock(skuNum);
            skuEntity.setWareId(wareId);
            skuEntity.setStockLocked(0);
            //TODO 远程查询sku的名字，如果失败，整个事务失败无需回滚(1) 两种方法
            try{
                R info = productFeignService.info(skuId);
                Map<String,Object> data = (Map<String, Object>) info.get("skuInfo");
                if (info.getCode() == 0){
                    skuEntity.setSkuName((String) data.get("skuInfo"));
                }
            }catch (Exception e){

            }
            wareSkuDao.insert(skuEntity);
        }else {
            wareSkuDao.addStock(skuId,wareId,skuNum);
        }

    }

    @Override
    public List<SkuHasStockVo> getSkuHasStock(List<Long> skuIds) {

        List<SkuHasStockVo> collect = skuIds.stream().map(skuId -> {
            SkuHasStockVo vo = new SkuHasStockVo();

            //查询当前sku的总库存量
            //SELECT SUM(stock-stock_locked) FROM `wms_ware_sku` WHERE sku_id=1
            Long count = baseMapper.getSkuStock(skuId);

            vo.setSkuId(skuId);
            vo.setHasStock(count==null?false:count>0);

            return vo;
        }).collect(Collectors.toList());

        return collect;
    }


    /**
     * 为某个订单锁定库存-------
     *
     * 库存解锁的场景
     * 1)、下订单成功，订单过期没有支付被系统自动取消、被用户手动取消。都要解锁库存
     * 2)、下订单成功，库存锁定成功，接下来的业务调用失败，导致订单回滚。
     *     之前锁定的库存就要自动解锁。
     *
     * */
    @Transactional//默认有异常都会回滚
    @Override
    public Boolean orderLockStock(WareSkuLockVo vo) {

        /**
         * 保存库存工作单的详情（追溯）
         * */
        WareOrderTaskEntity taskEntity = new WareOrderTaskEntity();
        taskEntity.setOrderSn(vo.getOrderSn());
        orderTaskService.save(taskEntity);

        //1、找到每个商品在哪个仓库都有库存
        List<OrderItemVo> locks = vo.getLocks();
        List<SkuWareHasStock> collect = locks.stream().map(item -> {
            SkuWareHasStock stock = new SkuWareHasStock();
            Long skuId = item.getSkuId();
            stock.setSkuId(skuId);
            stock.setNum(item.getCount());
            //查询这个商品哪里有库存
            List<Long> wareIds = wareSkuDao.listWareIdHasSkuStock(skuId);
            stock.setWareId(wareIds);
            return stock;
        }).collect(Collectors.toList());


        //2、锁定库存
        for (SkuWareHasStock hasStock : collect) {
            Boolean skuStocked = false;

            Long skuId = hasStock.getSkuId();
            List<Long> wareIds = hasStock.getWareId();
            if (wareIds == null || wareIds.size()==0){
                //所有仓库都没有这个商品的库存
                throw new NoStockException(skuId);
            }
            //1)、如果每一个商品都锁定成功，将当前商品锁定了几件的工作单记录发给MQ
            //2)、锁定失败。前面保存的工作单信息就回滚了。发送出去的消息，即使要解锁记录，由于去数据库查不到id，所以就不用解锁
            //    但是数据库的记录已经回滚了（两张task的表），两张表没有记录，要发向MQ发送完整的TaskDetail信息
            for (Long wareId : wareIds) {
                //成功返回1  失败返回0
                Long result = wareSkuDao.lockSkuStock(skuId,wareId,hasStock.getNum());
                if (result == 1){
                    skuStocked = true;

                    //TODO 告诉MQ库存锁定成功
                    WareOrderTaskDetailEntity detailEntity = new WareOrderTaskDetailEntity(null, skuId, "", hasStock.getNum(), taskEntity.getId(), wareId, 1);
                    orderTaskDetailService.save(detailEntity);
                    //发消息告诉MQ
                    StockLockedTo lockedTo = new StockLockedTo();
                    lockedTo.setId(taskEntity.getId());
                    StockDetailTo detailTo = new StockDetailTo();
                    BeanUtils.copyProperties(detailEntity,detailTo);
                    //只发id不行，防止数据库的内容回滚
                    lockedTo.setDetailTo(detailTo);
                    rabbitTemplate.convertAndSend("stock-event-exchange","stock.locked",lockedTo);
                    break;
                }else {
                    //当前商品的当前仓库锁定失败
                }
            }
            if (skuStocked == false){
                //所有仓库都没有这个商品的库存
                throw new NoStockException(skuId);
            }
        }

        //3、全部商品锁定成功
        return true;
    }


    /**
     * 解锁——————
     * 情况：
     * 1、下订单成功，库存自动解锁，业务失败，库存数据自动解锁
     * 2、库存锁失败，库存没有数据
     * */
    @Override
    public void unLockStocks(StockLockedTo to) {
        StockDetailTo detailTo = to.getDetailTo();
        Long detailToId = detailTo.getId();
        //查询数据库的库存关于这个订单有没有数据 有：解锁 没有：不用解锁
        WareOrderTaskDetailEntity byId = orderTaskDetailService.getById(detailToId);
        if (byId != null){
            //解锁
            //情况：
            // 1、没有订单（号），必须解锁
            // 2、有这个订单（号）：情况：看订单状态：
            // 已取消：解锁库存
            // 没取消：不能解锁
            Long id = to.getId();
            WareOrderTaskEntity taskEntity = orderTaskService.getById(id);
            String orderSn = taskEntity.getOrderSn();//根据订单号查询订单状态
            R r = orderFeignService.getOrderStatus(orderSn);
            if (r.getCode() == 0){
                OrderVo orderVo = r.getData(new TypeReference<OrderVo>() {
                });
                if (orderVo == null || orderVo.getStatus() == 4){
                    //订单不存在、订单已确认取消，解锁库存
                    if (byId.getLockStatus() == 1){
                        //如果当前状态为1（已锁定）才可以解锁
                        unLockStock(detailTo.getSkuId(),detailTo.getWareId(),detailTo.getSkuNum(),detailToId);
                    }
                }
            }else {
                //没有订单数据
                throw new RuntimeException("远程服务失败");
            }

        }else {
            //无需解锁
        }
    }

    /**
     * 订单关闭马上给库存发一个解锁信号（防止机器订单延迟宕机发不出解锁消息，导致库存消息优先到期，
     * 使服务器什么都不做，导致库存无法解锁）
     * */
    @Transactional
    @Override
    public void unLockStocks(OrderTo orderTo) {
        String orderSn = orderTo.getOrderSn();
        //查一下最新的库存状态，防止重复解锁库存
        WareOrderTaskEntity taskEntity = orderTaskService.getOrderTaskByOrderSn(orderSn);
        Long id = taskEntity.getId();
        //按照工作单找到没有解锁的库存，进行解锁
        List<WareOrderTaskDetailEntity> entities = orderTaskDetailService.list(new QueryWrapper<WareOrderTaskDetailEntity>().
                eq("task_id", id).eq("lock_status", 1));
        //Long skuId,Long wareId,Integer num,Long taskDetailId
        for (WareOrderTaskDetailEntity entity : entities) {
            unLockStock(entity.getSkuId(),entity.getWareId(),entity.getSkuNum(),entity.getId());
        }


    }

    /*解锁库存方法*/
    private void unLockStock(Long skuId,Long wareId,Integer num,Long taskDetailId){
        //库存解锁
        wareSkuDao.unLockStock(skuId,wareId,num);
        //更新工作单状态
        WareOrderTaskDetailEntity taskDetailEntity = new WareOrderTaskDetailEntity();
        taskDetailEntity.setId(taskDetailId);
        taskDetailEntity.setLockStatus(2);//设置已解锁状态
        orderTaskDetailService.updateById(taskDetailEntity);
    }



    @Data
    class SkuWareHasStock{
        private Long skuId;
        private Integer num;
        private List<Long> wareId;
    }

}